Headphone



FIG. 1 is a perspective view of a pair of headphone showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation thereof, this and the rear elevation being of identical design;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevation thereof, this and the opposite side elevation being of identical design.

The cord and jack have been shown removed from FIGS. 2, 4, and 5 for ease of illustration. 

The ornamental design for a headphone, as shown and described. 